P
US10459199B2ActiveUtilityPatentIndex 72

Five-piece optical lens system with a wide field of view

Assignee: NEWMAX TECHNOLOGY CO LTDPriority: Jul 5, 2017Filed: Jul 5, 2017Granted: Oct 29, 2019
Est. expiryJul 5, 2037(~11 yrs left)· nominal 20-yr term from priority
Inventors:HUANG CHING-YUN
G02B 13/0045G02B 9/60G02B 13/06
72
PatentIndex Score
2
Cited by
14
References
19
Claims

Abstract

A five-piece optical lens system with a wide field of view includes, in order from the object side to the image side: a first lens element with a negative refractive power, the first lens element being made of glass, a second lens element with a positive refractive power, a stop, a third lens element with a positive refractive power, a fourth lens element with a negative refractive power, a fifth lens element with a positive refractive power. Such arrangements can provide a five-piece optical lens system which has a wide field of view, high resolution, short length and less distortion.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A five-piece optical lens system with a wide field of view, in order from an object side to an image side, comprising:
 a first lens element with a negative refractive power, having an object-side surface being convex near an optical axis and an image-side surface being concave near the optical axis, the first lens element being made of glass, at least one of the object-side surface and the image-side surface of the first lens element being aspheric; 
 a second lens element with a positive refractive power, having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the second lens element being aspheric; 
 a stop; 
 a third lens element with a positive refractive power, having an object-side surface being convex near the optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the third lens element being aspheric; 
 a fourth lens element with a negative refractive power, having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the fourth lens element being aspheric; and 
 a fifth lens element with a positive refractive power, having an object-side surface being convex near the optical axis and an image-side surface being concave near the optical axis, at least one of the object-side surface and the image-side surface of the fifth lens element being aspheric and provided with at least one inflection point; 
 wherein a focal length of the second lens element is f2, a focal length of the third lens element is f3, and they satisfy the relation: 2.1<f2/f3<5. 
 
     
     
       2. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, and they satisfy the relation: −1.1<f1/f2<−0.25. 
     
     
       3. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and they satisfy the relation: −1.6<f3/f4<−0.7. 
     
     
       4. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and they satisfy the relation: −1<f4/f5<−0.45. 
     
     
       5. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the first lens element is f1, the focal length of the third lens element is f3, and they satisfy the relation: −2.6<f1/f3<−1.8. 
     
     
       6. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the second lens element is f2, a focal length of the fourth lens element is f4, and they satisfy the relation: −5.0<f2/f4<−3.1. 
     
     
       7. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the third lens element is f3, a focal length of the fifth lens element is f5, and they satisfy the relation: 0.57<f3/f5<1.05. 
     
     
       8. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the second lens element and the third lens element combined is f23, a focal length of the fourth lens element and the fifth lens element combined is f45, and they satisfy the relation: −0.35<f23/f45<0.3. 
     
     
       9. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the first lens element and the second lens element combined is f12, a focal length of the third lens element and the fourth lens element combined is f34, and they satisfy the relation: −3.6<f12/f34<−0.07. 
     
     
       10. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the third lens element and the fourth lens element combined is f34, a focal length of the fifth lens element is f5, and they satisfy the relation: −46<f34/f5<8. 
     
     
       11. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the first lens element is f1, a focal length of the second lens element, the third lens element and the fourth lens element combined is f234, and they satisfy the relation: −1<f1/f234<−0.17. 
     
     
       12. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the second lens element, the third lens element and the fourth lens element combined is f234, a focal length of the fifth lens element is f5, and they satisfy the relation: 2<f234/f5<5.5. 
     
     
       13. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the first lens element, the second lens element and the third lens element combined is f123, a focal length of the fourth lens element is f4, and they satisfy the relation: −0.8<f123/f4<−0.3. 
     
     
       14. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the first lens element, the second lens element and the third lens element combined is f123, a focal length of the fourth lens element and the fifth lens element combined is f45, and they satisfy the relation: −0.28<f123/f45<0.27. 
     
     
       15. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein the focal length of the first lens element is f1, a focal length of the second lens element, the third lens element, the fourth lens element and the fifth lens element combined is f2345, and they satisfy the relation: −2.3<f1/f2345<−1.6. 
     
     
       16. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the relation: 27<V1−V2<40. 
     
     
       17. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and they satisfy the relation: 27<V3−V4<40. 
     
     
       18. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the five-piece optical lens system with a wide field of view is f, a distance from the object-side surface of the first lens element to an image plane along the optical axis is TL, and they satisfy the relation: 0.05<f/TL<0.2. 
     
     
       19. The five-piece optical lens system with a wide field of view as claimed in  claim 1 , wherein a focal length of the first lens element is f1, a focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: −3.15<f1/f23<−2.15.

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